IPX Manual RB01
2.4
EXPOSURE CONTROL
2.4
.1 Electronic
Shutter
During normal camera operation, the exposure time is fixed and determined
by the frame rate. The electronic shutter can be used to precisely control the
image exposure time under bright light conditions. The electronic shutter
does not affect the frame rate, it only reduces the amount of electrons
collected. The desired exposure time is set by positioning a short pulse,
SHUTTER, with respect to the vertical transfer pulse, VCCD – Figure 2.29.
The electronic shutter pulse can be positioned within the entire frame timing
period with a precision of 1 line (4 lines for IPX-1M48).
VCCD
SHUTTER
Frame Time
Exposure
Figure 2.29 - Electronic Shutter Position
CAUTION NOTE
1.
The electronic shutter can be enabled in all camera modes.
2.
Position
e window will
res
2.4.2 Long
Integration
Long integration is used for extending the image exposure time beyond the
standard frame time. During normal camera operation, the minimum frame
rate determines the maximum exposure time. The desired exposure time can
be adjusted (increased) by moving the vertical transfer pulse, VCCD,
beyond the normal exposure range – Figure 2.30. The integration time can
be programmed in 10 millisecond increments from 10 ms (camera
dependent) up to 10 seconds. Enabling long integration reduces the frame
rate. The resultant frame rate can be calculated using formula 4.2. This
mode is displayed on the LED by slow pulsation with a 2 second interval –
refer to Status LED section.
ing the shutter signal outside the fram
ult
in
an
error.
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